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Message: <blockquote data-quote="JonnyB" data-source="post: 156217" data-attributes="member: 2779"><p>Thanks JKD - in a further twist, I replaced the screen grid resistor, however on powering up, I discovered that although there was B+ voltage on the plate, there was 0v on the hot side of the O/P trasformer primary. On looking at the circuit I figured it was a  burned out trace between the plate and transformer so soldered in a link wire. On powering up again there was a flash and smoke which was rather disheartening to say the least. Initial thoughts were that I'd shorted something but on checking, all voltages were normal. I adjusted the bias and then checked with a guitar and happy to report she is sounding sweet again. At some point I'll need to strip down to find out what happened and check for any further damage but all in all a weird one...</p></blockquote><p>[/QUOTE]</p>